A comparative study of continuous beams prestressed with bonded FRP and steel tendons

Lou, Tiejiong; Lopes, Sérgio M.R.; Lopes, Adelino V.

doi:10.1016/j.compstruct.2015.01.009

Cited by 27 publications

(13 citation statements)

References 21 publications

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“…Some researchers found that deflection of beams prestressed with CFRP tendons was equivalent to that of reference beams prestressed by steel strands provided that the failure was controlled by the crushing of concrete in the compression zone while if the failure was governed by rupture of the CFRP bars, the deflection at failure was considerably smaller. The number of cracks in beams prestressed by CFRP was less than that of the beams with steel due to the lower flexural bond strength of the CFRP bars [9]. This behavior was also observed by Motavalli et al [10].…”

supporting

confidence: 66%

Mechanical Behaviors of High Performance Concrete Beams Prestressed with CFRP Strands

Xue¹,

Wang²,

Zheng³

2016

JRST

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ABSTRACT:The merits of high performance concrete (HPC) and fiber reinforced polymer (FRP) could be combined for using in the concrete structures to improve the structural mechanical behavior. Six beams cast with HPC and prestressed with Carbon FRP (CFRP) strands were tested and discussed in this paper. Test variables included partial prestressing ratio (PPR) of CFRP strands and material of reinforcements (steel and Glass FRP). Test results indicated that all the beams failed in two modes, i.e., compression failure mode and tension failure mode. The ultimate deflection of all the beams reached 1/70-1/41 of the spans and the ductility coefficients of the steel reinforced beams were higher than 3.5 (except the one with the highest steel reinforcement ratio), indicating good deformability and ductility. An increase in partial prestressing ratio (PPR) had a positive effect on ductility. The ductility of Glass FRP reinforced beam was much lower than that of steel reinforced beams while the deformability was quite similar.

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confidence: 66%

Mechanical Behaviors of High Performance Concrete Beams Prestressed with CFRP Strands

Xue¹,

Wang²,

Zheng³

2016

JRST

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“…Due to this weakness of FRP tendons, the concrete beams prestressed with FPR tendons exhibit catastrophic brittle failure characterized by a sudden release of elastic energy at the rupture load of the FRP tendons (Lee et al, 2015(Lee et al, , 2017. On the contrary, prestressing the ductile corrosion-resistant material can improve the ductility and durability of the prestressed concrete beam (Knight et al, 2014;Lou et al, 2015). Thus, a new prestressing concrete beam with ductile and corrosion-resistant material need be developed to solve the corrosion problem of unbonded prestressing steel system and catastrophic brittle failure of prestressing FRP system.…”

Section: Introductionmentioning

confidence: 99%

Feasibility and flexural behavior of RC beams prestressed with straight unbonded aluminum alloy tendons

Chang

Xing

Zhao

et al. 2020

Advances in Structural Engineering

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This paper investigates the feasibility and flexural behavior of reinforced concrete beams internally prestressed with straight unbonded aluminum alloy tendons by testing five partially prestressed beams and one reference beam. For each beam specimen, load-deflection curves, failure modes and cracking behavior, the relationship between load and strains in steel and prestressing aluminum alloy tendons were examined and analyzed. In particular, the effects of effective prestress, combined reinforcement index (CRI), and partial prestressing ratio (PPR) on flexure of concrete beams were discussed. The test results indicated that the spacing and width of concrete cracks of prestressed beams containing the same amount of bonded longitudinal steel reinforcement decreased with the increase of effective prestress, and the combined reinforcement index governs flexural behavior of the prestressed beams. The flexural crack width and displacement ductility exhibited a reduction with the increase of CRI. In addition, an analytical model was established to calculate the flexural strength and corresponding deflection at midspan of the concrete beams internally prestressed with unbonded aluminum alloy tendons by suggesting a new simplified curvature distribution, which is more accordant with the original curvature distribution. The proposed model provides a relatively good estimation of the flexural capacity and midspan deflection of the prestressed beams.

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“…The effect of bond between FRP tendons and concrete on the flexural behavior of FRP prestressed concrete beams was found to be rather important [2]. Bonded FRP tendons may lead to rupture failure of the beams [3,4], while the use of unbonded tendons is an effective and economical solution to prevent FRP rupture [5]. Extensive studies have been conducted to assess the short-term behavior of concrete beams with internal [5][6][7][8] or external [9][10][11][12][13] unbonded FRP tendons.…”

Section: Introductionmentioning

confidence: 99%

Time-dependent assessment and deflection prediction of prestressed concrete beams with unbonded CFRP tendons

Lou

Karavasilis

2018

Composite Structures

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This paper presents the assessment of the time-dependent behavior and the prediction of the long-term deflection of concrete beams prestressed with internal unbonded carbon fiber reinforced polymer (CFRP) tendons. A numerical model for the time-dependent analysis of concrete beams prestressed with unbonded tendons is calibrated against experimental results. Parametric numerical simulations are then conducted on simply supported unbonded prestressed concrete beams subjected to long-term sustained loads to investigate the effect of using CFRP tendons instead of low-relaxation steel ones, the magnitude of the initial prestress, the loading conditions, and the quantity of the compressive reinforcing steel. The results show that the long-term prestress loss of beams with CFRP tendons is considerably higher than that of beams with steel tendons. Moreover, it is shown that increasing the quantity of compressive reinforcing steel leads to a substantial decrease in long-term downward deflection. A modification of the ACI 318-14 equation is proposed to predict the time-dependent deflection of prestressed concrete beams with unbonded FRP or steel tendons.

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A comparative study of continuous beams prestressed with bonded FRP and steel tendons

Cited by 27 publications

References 21 publications

Mechanical Behaviors of High Performance Concrete Beams Prestressed with CFRP Strands

Mechanical Behaviors of High Performance Concrete Beams Prestressed with CFRP Strands

Feasibility and flexural behavior of RC beams prestressed with straight unbonded aluminum alloy tendons

Time-dependent assessment and deflection prediction of prestressed concrete beams with unbonded CFRP tendons

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